android material design之BottomSheet（六）

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这个控件在手机迅雷中用的挺多的，而且用的地方和位置也很合适，楼主在这里简单写了一下，可以当做一个dialog用，但是又比dialog好用，至于为什么好用大家看到xml后应该会感觉出来的，



上代码

activity

package com.fanyafeng.materialdesign.activity;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomSheetBehavior;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.view.ViewCompat;
import android.support.v4.widget.NestedScrollView;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;

import com.fanyafeng.materialdesign.BaseActivity;
import com.fanyafeng.materialdesign.R;

public class BottomSheetActivity extends BaseActivity {
private NestedScrollView nestedBottom;
private BottomSheetBehavior bottomSheetBehavior;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bottom_sheet);

title = "测试bottom sheet";

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
initView();
initData();
}

private void initView() {
nestedBottom = (NestedScrollView) findViewById(R.id.nestedBottom);
}

private void initData() {

initNest(nestedBottom);
}

private void initNest(final View view) {
bottomSheetBehavior = BottomSheetBehavior.from(view);
bottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);

bottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
@Override
public void onStateChanged(@NonNull View bottomSheet, int newState) {
if (newState == BottomSheetBehavior.STATE_COLLAPSED || newState == BottomSheetBehavior.STATE_HIDDEN) {
view.setVisibility(View.GONE);
}
}

@Override
public void onSlide(@NonNull View bottomSheet, float slideOffset) {
view.setVisibility(View.VISIBLE);
ViewCompat.setAlpha(view, slideOffset);
}
});
}

@Override
public void onClick(View v) {
super.onClick(v);
switch (v.getId()) {
case R.id.btnBottomPop:
if (bottomSheetBehavior.getState() == BottomSheetBehavior.STATE_EXPANDED) {
bottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
} else {
bottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
}
break;
}
}
}

来看xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.fanyafeng.materialdesign.activity.BottomSheetActivity">

<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">

<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:popupTheme="@style/AppTheme.PopupOverlay" />

</android.support.design.widget.AppBarLayout>

<include layout="@layout/content_bottom_sheet" />
<!--父控件必须是CoordinatorLayout-->
<android.support.v4.widget.NestedScrollView
android:id="@+id/nestedBottom"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="@string/bottom_sheet_behavior">

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="?attr/actionBarSize"
android:orientation="vertical">

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPrimary"
android:padding="80dp"
android:text="人不会死在绝境，却往往栽在十字路口"
android:textColor="@android:color/white" />

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPrimary"
android:padding="80dp"
android:text="人不会死在绝境，却往往栽在十字路口"
android:textColor="@android:color/white" />

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPrimary"
android:padding="80dp"
android:text="人不会死在绝境，却往往栽在十字路口"
android:textColor="@android:color/white" />

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPrimary"
android:padding="80dp"
android:text="人不会死在绝境，却往往栽在十字路口"
android:textColor="@android:color/white" />

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPrimary"
android:padding="80dp"
android:text="人不会死在绝境，却往往栽在十字路口"
android:textColor="@android:color/white" />

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPrimary"
android:padding="80dp"
android:text="人不会死在绝境，却往往栽在十字路口"
android:textColor="@android:color/white" />

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPrimary"
android:padding="80dp"
android:text="人不会死在绝境，却往往栽在十字路口"
android:textColor="@android:color/white" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>

<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="@dimen/fab_margin"
android:src="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
<pre name="code" class="html">app:layout_behavior="@string/appbar_scrolling_view_behavior"

tools:context="com.fanyafeng.materialdesign.activity.BottomSheetActivity" tools:showIn="@layout/activity_bottom_sheet"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <Button android:id="@+id/btnBottomPop"
android:layout_width="match_parent" android:layout_height="wrap_content" android:onClick="onClick" android:text="弹出" android:textColor="?attr/colorPrimaryDark" android:textSize="@dimen/activity_horizontal_margin" /> </LinearLayout></android.support.v4.widget.NestedScrollView>

其中的layout_behavior很重要

app:layout_behavior="@string/appbar_scrolling_view_behavior"